Key Technology Research Of Downhole Hydraulic Selective Separation Equipment Of Coal And Gangue

The coal mining with a lot of gangue, gangue transported to the ground and accumulated as hillock, in order to achieve the goal of green mining, direct separation of coal and gangue in the underground mining, sorting out of gangue used for backfill mined out area, not only solves the gangue pollution problems in mining area, but also perfectly controlled of harm, which caused by collapse of mined out area. According to the different hardness characteristics of coal and gangue, put forward a new kind of selectivity separation equipment of hydraulic, which use of coal and gangue in the underground. Therefore, the method of combining use of theoretical research, experimental data and simulation, this paper uses the method which combined with the theoretical research, experimental data and simulation, the key technology of the hydraulic type selectivity separation equipment for coal and gangue underground.Based on the characteristics of hydraulic type selectivity separation equipment structure for coal and gangue underground and crushing process, and established at the situation of the tensile stress and shear stress, coal and gangue failure criterion; Established the finite element model of buckling analysis for a single particle of coal and gangue crushing, the experimental data and the theoretical simulation results were processed, fitting the relationship between material compressive strength and buckling strength.Rate of lost coal and gangue mixed rate are proposed to evaluate the coal and gangue crushing separation effect, gives the calculation formula of three kinds of critical fracture load for the maximum rate of lost coal and gangue mixed rate, a criterion has been established for selective crushing separation of coal and gangue; hydraulic type selectivity separation equipment for coal and gangue underground were designed, Introduces the principle of sorting separation equipment and hydraulic circuit working principle; stress analysis of key components equipment for material extrusion process, deduces the relationship of hydraulic lever set pressure value of crushing load with coal and gangue particles, kinematic analysis of eccentric cam on the separation equipment, given the extrusion force characteristics of materials, through the analysis of the displacement, velocity, acceleration of extrusion on the eccentric cam, motion characteristics was researched for eccentric cam.Through the ANSYS Workbench contact simulation analysis, explored the effect of breaking effect of coal and gangue when plate angle under certain range, research shows that:optimum effect of selectivity crushing for coal and gangue occurred the plate angle in the15°; For the range of particle size for processing equipment, explored the effect of breaking effect of coal and gangue when feed particle size under certain range, It is a certain guiding significance to the graded material before crushing processing.